C. Fishing
I think fishing would make sense due to living in a river valley.
I think the phrase you are looking for is "natural resources" - these include fresh water, food and fertile soil on which crops can easily be planted.
Answer: prosperity
The economy of Australia is characterized not only by high unemployment rate, low unemployment rate nor foreign subsidies but by prosperity. The economic prosperity enjoyed by Australia is due to the high industrialization of the country and its modern technologies.
Answer:
latitude measures the number of degrees North or South of the equator